America this morning. We begin this Tuesday with the latest details of that mass shooting at the Washington navy yard the motive for the shooting still -- the facility remains open this morning with only essential personnel reported for work here is the very latest thirteen people including the lone gunman are dead. Eight victims are her when running overnight that he used security clearance to enter that building with a rifle and a handgun. Our coverage now begins an ABC's tomorrow Bradley -- that navy yard in Washington tomorrow. -- and I had a good morning the navy yard reopens today for essential personnel as authorities continue searching for clues about the suspect. Overnight we -- that the suspect may have had a grudge against the navy. The F. BI says 34 year old -- -- a former navy reservists is behind the terror at Washington's navy yard. -- twelve people were killed eight injured before -- has died in a gun battle with police we do now feel comfortable that we have the single and -- Person responsible for the loss of life this morning authorities are urgently seeking the public's help to find out more about -- and Alexis. We are looking to learn everything we can about his recent movements this contacts and as associates. Overnight in Brooklyn authorities questioned the suspect's family as they continue searching for a motive sources tell ABC news a -- had a valid security clearance that allowed him access to building 197. Worth 3000 military and civilian personnel work. The horror started as a workday began. He came around a corner he aimed -- Canada and any fired at least two Hickory shafts be raised -- aimed at us and bargaining hit -- on the wall. The navy yard stayed on lockdown for more than six hours the horrifying attack felt across Washington. The FAA halted all flights in and out of Reagan national airport. ABC news has learned the suspect -- the history of disturbing behavior he was arrested and -- -- Accused of recklessly discharging a firearm into a neighbor's apartment. And in 2004. Alexis confessed to shooting out the tires of another man's car. Steve sent overnight some families were still awaiting word about their loved ones the victims range from age 46 to 73. All civilians died and -- -- -- Houston on Bradley in Washington for us this morning thank you and overnight we have learned the names some of those killed at the navy yard seven of the twelve victims may include. 59 year old Michael Arnold 53 year old Sylvia Frazier 62 year old -- guard John Roger Johnson who was 73. Frank -- who was 1561 year old Vishnu Pandit. And 64 and -- sorry 46 year old Kenneth Bernard Procter and the names of the rest of those victims they are being withheld until families can be notified.

This transcript has been automatically generated and may not be 100% accurate.

Aaron Alexis: The Man Behind the Washington Navy Yard Shooting

The father of the man who shot and killed 12 people says his son had an anger management problem.

Washington Navy Yard Shooting

Authorities search for active shooter as employees remain on lockdown.

Navy Yard Shooting Suspect Only Gunman in Rampage
: Officials

The 12 deceased shooting victims range in age from 46 to 73 years old.

Navy Yard Survivor Saw Gun Before She Saw Shooter

Cmdr. Jirus says the man standing next to him was shot dead.

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